1 Khetho ea rabara e tala
Plate heat exchanger rubber gasket ka nako e ts'oanang ka lehlakoreng la khase ea mocheso o phahameng, lehlakoreng la metsi la karolo ea khatello e phahameng, hape le ho kopana le moea, maemo a ho sebetsa a batla ho feta. Ka hona, thepa e lokela ho ba e ntle haholo ea ho hanyetsa mocheso oa mocheso, 'me e ka mamella bohareng ba metsi le mouoane oa eona. Maemong a joalo, o lokela ho khetha karolo ea boima ba propylene ea 40% ~ 50% ea EPDM, hobane mofuta ona oa EPDM elasticity ke oona o molemo ka ho fetisisa.
EPDM e nang le karolo e phahameng ea boima ba karolo ea boraro ea monoma e na le elasticity e ntle le sete e tlaase ea compression; leha ho le joalo, ka lebaka la tekanyo e phahameng ea ho hokahanya, matla a tsitsipano le bolelele nakong ea khefu a fokotseha, 'me ho hanyetsa botsofali ho boetse ho fokola. Ho phaella moo, khanyetso ea botsofali ea EPDM e nang le ENB e le monoma ea boraro e molemo ho feta ea EPDM e nang le HD.
2 Sistimi ea ho folisa
Ka kakaretso, rabara ea EPDM e ka ts'oaroa ka mefuta e 'meli ea lits'ebetso tsa vulcanization: peroxide le sulfur yellow vulcanization. The cross-linking bond structure of peroxide vulcanization system is CC bond, ha the cross-linking bond structure of sulfur vulcanization system is CS bond. Bond ea CC e tsitsitse haholo ka mocheso ho feta bond ea CS, kahoo rabara ea EPDM e hanyetsanang le mocheso o phahameng e kenngoa ka peroxide. Peroxide e sebelisoang haholo ke DCP. Ka ho eketseha ha tekanyo ea DCP, rabara e nang le vulcanized e fetoha butle-butle ho tloha ho undersulfurization ea pele, matla a tlaase le deformation e kholo ho ea ho eketseha ha matla le ho fokotseha ha deformation; joale tekanyo ea vulcanization e ntse e eketseha, matla a qala ho fokotseha, 'me deformation e fihla bonyane; qetellong, ka mor'a ho feteletseng ha moemeli oa vulcanizing, karolo ea ketane ea limolek'hule e qala ho senya ho senyeha ha ketane, matla a ntse a tsoela pele ho fokotseha, 'me deformation e eketseha butle-butle.
3.Setlatsi
EPDM ke ea rabara e se nang kristale, matla a rabara e tala ha a phahame. Empa ka mor'a ho eketsa li-filler tse matlafatsang, matla a eketseha haholo. Li-fillers tse matlafatsang ka kakaretso ha li na phello e fokolang ea ho hanyetsa mocheso, empa ho eketsa palo ea li-filler ho ntse ho thusa ho ntlafatsa ho hanyetsa mocheso oa rabara, empa hape ho fokotsa litšenyehelo.
Ha boemo ba carbon black bo ntse bo eketseha, sete sa compression se fokotseha, elasticity ea eketseha, 'me matla a fokotseha. Matla a N990 carbon black a tlase haholo mme a thata ho laola tlhahiso, kahoo ha e sebelisoe. Ka ho khetha N762 carbon black, boleng bo tlaase ba compression bo ka fumanoa. E le ho thusa ho hasana ha carbon black le ho fumana ts'ebetso e ntle ea ts'ebetso, khetha oli e nyenyane ea polasetiki ea parafine, e lumellanang haholo le rabara ea ethylene propylene.
4. Crosslinking agent
Ha ho na maqhama a sa tsitsang holim'a ketane e kholo ea EPDM, le hoja vulcanization ea peroxide e ka sebelisoa, empa lebelo la vulcanization le lieha, katleho ea crosslinking e tlaase. E le ho tsitsisa le ho potlakisa ts'ebetso ea vulcanization, hoa hlokahala ho sebelisa moemeli oa crosslinking. TAC/GR e phekotsoeng e betere bakeng sa phetiso le boima ba 'mele.
Ka keketseho ea palo ea TAC / GR, matla a tsitsipano, ho lelefatsa nako ea khefu le ho hatella deformation e sa feleng ea rabara e nang le vulcanized e ile ea fokotseha, 'me boleng ba MH ba khatello ea kelello e sa khaotseng bo ile ba eketseha. Ho ka bonoa hore sekhahla sa li-crosslinking tsa rabara e senyehileng se ile sa ntlafatsoa, thepa ea mochini e fokotsehile, empa elasticity e ile ea e-ba kholoanyane. Ka nako e ts'oanang, boleng ba ML bo fokotsehile, bo bontšang hore viscosity ea Mooney e fokotsehile, metsi a rabara a ile a ntlafatsoa, 'me ho ne ho le bonolo ho sebetsa; Ts1 e ne e sa fetohe, 'me boleng ba t 90 bo ile ba khutsufatsoa,' me ho hlakile hore lebelo la vulcanization le ile la ntlafatsoa. Ts'ebetso ea botsofali e ne e fokola haholo ho 1.5phr ea TAC/GR. Sena se ka ba ka lebaka la ho ba teng ha lithuso tse hokahanyang, ho kenya ts'ebetso ea peroxide vulcanization, ho khutsufatsa nako ea vulcanization, ho fokotsa monyetla oa ho robeha ha limolek'hule tsa rabara le ho se leka-lekane ha mocheso o phahameng. Ha palo e le ngata haholo, e ntlafatsa ho tsofala ha sefapano sa rabara le ho fokotsa ho hanyetsa mocheso oa EPDM. Ka mor'a ho bapisa, compression deformation e sa feleng e molemo ho 2phr, 'me ho hanyetsa mocheso ha hoa etsoa sehlabelo haholo, kahoo TAC / GR e sebelisoa ho 2phr.
5.Antioxidant
EPDM e ka sebelisoa nako e telele ho 150 ℃ , empa ho feta 150 ℃ , limolek'hule li qala ho tsofala butle-butle, 'me ka 180 ℃ , ketane ea molek'hule ea rabara e tla senyeha butle-butle. E le ho ntlafatsa ts'ebetso ea eona ka mocheso o phahameng, li-additives tse sireletsang li tlameha ho sebelisoa. Tabeng ea mecha ea phatlalatso ea mouoane oa metsi, ho ka sebelisoa antioxidant RD, e hanyetsanang le mocheso o phahameng empa ha e ame habonolo vulcanization. Ho phaella moo, 0.5phr antioxidant D e ka sebelisoa ho matlafatsa bokhoni ba ho hanyetsa oksijene moeeng le ho ntlafatsa ho hanyetsa mokhathala oa flexural. Karolelano ea RD/anti-butyl=1.8/0.5.
Qetello
Nts'etsopele ea rabara ea EPDM ea mouoane e sa keneleng mocheso o phahameng oa metsi, ho tsepamisitsoe maikutlo ke ho kopana le thepa ea mochini tlas'a motheo oa ho eketsa ho hanyetsa botsofali le ho fokotsa boleng ba compression bo sa feleng.
( 1) Rabara e tala ea EPDM e khethiloe ka 40% ~ 50% ea propylene le karoloana ea boima bo bohareng ba ENB e le monoma ea boraro.
(2) Sistimi ea vulcanization e amohela DCP / TAC, e thusang ho ntlafatsa ts'ebetso ea crosslinking, ho hanyetsa botsofali le ts'ebetso ea ts'ebetso.
( 3) Sebelisa e phahameng elasticity carbon black N762 ka hohle kamoo ho ka khonehang, e ka thusang ho ntlafatsa ho hanyetsa mecha ea phatlalatso ea permeability le ts'ebetso ea botsofali, 'me e ka fokotsa litšenyehelo.
( 4) Amohela tsamaiso ea ts'ireletso ea antioxidant RD / antioxidant D, e nang le mocheso o phahameng oa antioxidant RD e le eona e ka sehloohong, le flexural-resistant-resistant and ozone-resistant antioxidant D e le eona e thusang.
( 5) Ts'ebetso ea tlhahiso e amohela vulcanization ea bobeli ea mocheso o phahameng ho eketsa tekanyo ea vulcanization.
(6) Ts'ebetso ea EPDM metsing a chesang haholo le mouoane oa metsi ho hlakile hore e molemo ho feta moeeng (mocheso o tšoanang). Empa leha ho le joalo, tšebeliso ea eona ea nako e telele ea mocheso e ntse e sa fete 150 ℃ ; mocheso oa tšusumetso ea 165 ℃ o loketse, o phahameng ka ho fetisisa o ke ke oa feta 180 ℃.
